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<p>点击 <a class="reference internal" href="#sphx-glr-download-how-to-work-with-microtvm-micro-reference-vm-py"><span class="std std-ref">这里</span></a> 下载完整的样例代码</p>
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<div class="sphx-glr-example-title section" id="microtvm-reference-virtual-machines">
<span id="tutorial-micro-reference-vm"></span><span id="sphx-glr-how-to-work-with-microtvm-micro-reference-vm-py"></span><h1>microTVM 虚拟机<a class="headerlink" href="#microtvm-reference-virtual-machines" title="永久链接至标题">¶</a></h1>
<p><strong>作者</strong>: <a class="reference external" href="mailto:areusch&#37;&#52;&#48;octoml&#46;ai">Andrew Reusch</a></p>
<p>此教学手册教您如何启动microTVM虚拟机。通过此手册，您可以在不安装microTVM依赖库的情况下使用物理设备进行开发。同时，当您需要使用microTVM重现一些代码行为时，例如编写bug报告，此手册能够提供有效的帮助。</p>
<p>microTVM可以有效地使用TVM在低端微控制器上构建和运行模型。microTVM旨在与各种各样的SoC和运行时环境（如裸机、RTOS等）相互兼容。然而，开发人员需要一些必要的软件依赖环境才能够共享和再现bug和运行结果。microTVM虚拟机旨在提供这些环境。</p>
<div class="section" id="how-it-works">
<h2>工作原理<a class="headerlink" href="#how-it-works" title="永久链接至标题">¶</a></h2>
<p>TVM代码仓库中并没有提供虚拟机，在 <code class="docutils literal notranslate"><span class="pre">apps/microtvm/reference-vm</span></code> 目录下的文件描述了如何使用 <a class="reference external" href="https://vagrantup.com">Vagrant</a> 虚拟机构建工具来创建一个microTVM虚拟机。</p>
<p>MicroTVM虚拟机分为两个部分：</p>
<ol class="arabic simple">
<li><p>一个Vagrant基础镜像，它包含了所有必要的软件依赖环境，构建该镜像的脚本保存在 <code class="docutils literal notranslate"><span class="pre">apps/microtvm/reference-vm/&lt;platfrom&gt;/base-box</span></code> 。当平台的“稳定”依赖环境发生变化时，TVM提交者将会运行这个脚本来生成新的基础镜像，该镜像会被上传到 <a class="reference external" href="https://app.vagrantup.com/tlcpack">Vagrant Cloud</a> 。</p></li>
<li><p>一个虚拟机工作环境，用户通常使用基础镜像作为起点来构建它。构建脚本保存在 <code class="docutils literal notranslate"><span class="pre">apps/microtvm/reference-vm/&lt;paltform&gt;</span></code> （除了 <code class="docutils literal notranslate"><span class="pre">base-box</span></code> ）。</p></li>
</ol>
</div>
<div class="section" id="setting-up-the-vm">
<h2>设置虚拟机<a class="headerlink" href="#setting-up-the-vm" title="永久链接至标题">¶</a></h2>
<div class="section" id="installing-prerequisites">
<h3>安装必要软件<a class="headerlink" href="#installing-prerequisites" title="永久链接至标题">¶</a></h3>
<p>这些必要软件包括：</p>
<ol class="arabic simple">
<li><p><a class="reference external" href="https://vagrantup.com">Vagrant</a></p></li>
<li><p>一个虚拟机管理程序（ <strong>VirtualBox</strong> 、 <strong>Parallels</strong> 或 <strong>VMWare Fusion/Workstation</strong> ）。TVM推荐使用 <a class="reference external" href="https://www.virtualbox.org">VirtualBox</a> ，因为它是免费的虚拟机管理程序，但请注意， <a class="reference external" href="https://www.virtualbox.org/wiki/Downloads#VirtualBox6.1.16OracleVMVirtualBoxExtensionPack">VirtualBox Extension Pack</a> 是使用USB转发功能所必要的扩展包。如果选择使用VirtualBox，您还可以考虑安装 <a class="reference external" href="https://github.com/dotless-de/vagrant-vbguest">vbguest</a> 插件。</p></li>
</ol>
<ol class="arabic simple" start="3">
<li><p>如果您还需要其他的插件， <a class="reference external" href="https://github.com/hashicorp/vagrant/wiki/Available-Vagrant-Plugins#providers">Vagrant provider plugin</a> 将提供更多程序插件（或在 <a class="reference external" href="https://www.vagrantup.com/vmware">此处</a> 查找有关VMWare的插件）。</p></li>
</ol>
</div>
<div class="section" id="first-boot">
<h3>首次启动<a class="headerlink" href="#first-boot" title="永久链接至标题">¶</a></h3>
<p>当您第一次使用microTVM虚拟机时，您需要在本地创建一个镜像，然后给它提供必要准备。</p>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span><span class="c1"># Replace zephyr with the name of a different platform, if you are not using Zephyr.</span>
~/.../tvm $ <span class="nb">cd</span> apps/microtvm/reference-vm/zephyr
<span class="c1"># Replace &lt;provider_name&gt; with the name of the hypervisor you wish to use (i.e. virtualbox, parallels, vmware_desktop).</span>
~/.../tvm/apps/microtvm/reference-vm/zephyr $ vagrant up --provider<span class="o">=</span>&lt;provider_name&gt;
</pre></div>
</div>
<p>这段命令行需要一些时间来运行，同时，它将在您的机器上占用4到5GB的存储空间。这些代命令行的作用如下：</p>
<ol class="arabic simple">
<li><p>下载 <a class="reference external" href="https://app.vagrantup.com/tlcpack/boxes/microtvm">MicroTVM基础镜像</a> ，然后使用它生成一个特定于这个TVM目录的新虚拟机。</p></li>
<li><p>将TVM目录挂载到虚拟机（如果使用 <code class="docutils literal notranslate"><span class="pre">git-subtree</span></code> ， <code class="docutils literal notranslate"><span class="pre">.git</span></code> 根目录将会被挂载）。</p></li>
<li><p>构建TVM并安装与之相对应的Python虚拟环境。</p></li>
</ol>
</div>
<div class="section" id="connect-hardware-to-the-vm">
<h3>将硬件连接到虚拟机<a class="headerlink" href="#connect-hardware-to-the-vm" title="永久链接至标题">¶</a></h3>
<p>接下来，您需要配置 USB 转发设置，以便通过USB接口将物理开发板连接到虚拟机（而不是直接连接到主机上的操作系统）。</p>
<p>建议您设置设备筛选器，而不是设置单次转发，因为在编程过程中设备通常会重新启动，而此时您需要再次启用转发。当这种情况发生时，开发用户可能不易察觉需要再次启动转发。开启设备筛选器的方法如下：</p>
<blockquote>
<div><ul class="simple">
<li><p><a class="reference external" href="https://www.virtualbox.org/manual/ch03.html#usb-support">VirtualBox</a></p></li>
<li><p><a class="reference external" href="https://kb.parallels.com/122993">Parallels</a></p></li>
<li><p><a class="reference external" href="https://docs.vmware.com/en/VMware-Workstation-Pro/15.0/com.vmware.ws.using.doc/GUID-E003456F-EB94-4B53-9082-293D9617CB5A.html">VMWare Workstation</a></p></li>
</ul>
</div></blockquote>
</div>
<div class="section" id="rebuilding-tvm-inside-the-reference-vm">
<h3>在microTVM虚拟机中重新构建TVM<a class="headerlink" href="#rebuilding-tvm-inside-the-reference-vm" title="永久链接至标题">¶</a></h3>
<p>在第一次启动之后，每当您修改了C++运行时代码或者切换到不同版本的时候，您都需要重新构建TVM以保持构建文件是最新的，这些构建文件在 <code class="docutils literal notranslate"><span class="pre">$TVM_HOME/build-microtvm-zephyr</span></code> 目录下。您可以通过重新配置虚拟机（在之前运行 <code class="docutils literal notranslate"><span class="pre">vagrant</span> <span class="pre">up</span></code> 命令的目录下运行 <code class="docutils literal notranslate"><span class="pre">vagrant</span> <span class="pre">provision</span></code> ），又或者自己手动重新构建TVM。</p>
<p>请注意：在microTVM虚拟机中的TVM构建文件 <code class="docutils literal notranslate"><span class="pre">.so</span></code> 与您主机上的构建文件是不同的。这也是为什么要将构建文件放置在 <code class="docutils literal notranslate"><span class="pre">build-microtvm-zephyr</span></code> 这个特殊目录下。</p>
</div>
<div class="section" id="logging-in-to-the-vm">
<h3>登录虚拟机<a class="headerlink" href="#logging-in-to-the-vm" title="永久链接至标题">¶</a></h3>
<p>虚拟机应该向主机提供唯一的主机名 <code class="docutils literal notranslate"><span class="pre">microtvm</span></code> 。您可以通过SSH登录到虚拟机：</p>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>$ vagrant ssh
</pre></div>
</div>
<p>然后 <code class="docutils literal notranslate"><span class="pre">cd</span></code> 到主机上访问TVM的相同路径。例如，在 Mac 上：</p>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>$ <span class="nb">cd</span> /Users/yourusername/path/to/tvm
</pre></div>
</div>
</div>
</div>
<div class="section" id="running-tests">
<h2>测试<a class="headerlink" href="#running-tests" title="永久链接至标题">¶</a></h2>
<p>当microTVM虚拟机完成配置工作，您可以使用 <code class="docutils literal notranslate"><span class="pre">poetry</span></code> 运行测试用例：</p>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>$ <span class="nb">cd</span> apps/microtvm/reference-vm/zephyr
$ poetry run python3 ../../../../tests/micro/qemu/test_zephyr.py --zephyr-board<span class="o">=</span>stm32f746g_disco
</pre></div>
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<p>如果您没有硬件设备，但仍希望运行测试用例，您可以在microTVM虚拟机上运行本地QEMU模拟器，详细命令如下：</p>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>$ <span class="nb">cd</span> /Users/yourusername/path/to/tvm
$ <span class="nb">cd</span> apps/microtvm/reference-vm/zephyr/
$ poetry run pytest ../../../../tests/micro/qemu/test_zephyr.py --zephyr-board<span class="o">=</span>qemu_x86
</pre></div>
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<p><a class="reference download internal" download="" href="../../_downloads/79027b28c061178b7ea56e3f047eeef1/micro_reference_vm.py"><code class="xref download docutils literal notranslate"><span class="pre">下载</span> <span class="pre">Python</span> <span class="pre">源代码:</span> <span class="pre">micro_reference_vm.py</span></code></a></p>
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